(Completed 1904–6.)
- Som.
- Shtshuka.
These two vessels, which are of the Holland-Bubnoff type, have a submerged displacement of about 150 tons. Petrol and electric motors are used for surface and submerged propulsion, and the speed is 9 ½ knots and 7 knots, above and below, respectively. Their armament consists of two bow tubes with four 18-inch Whitehead torpedoes. Their complement is about fifteen officers and men.
Sterliad Class.
(Completed 1905–6.)
- Sterliad.
- Bialuga.
- Peskar.
These three vessels are also of the Holland-Bubnoff type. They have a submerged displacement of 150 tons. The petrol motors for surface propulsion are of 160 H.-P. The speed is 9 ½ knots and 7 knots, above and below, respectively. Their armament consist of two bow tubes with four 18-inch Whitehead torpedoes. Their complement is eleven to fifteen officers and men.
Sig.
(Completed 1906.)
A submarine of the Lake type; similar in almost every respect to vessels of the Ostr class.